the knives are gona fight probably when they get bigger.. my clown knife was 1" bigger than my outher clown knife and he beat the crap outa it. i might just of had a crazy knife fish though
i was also looking for a brown knife but they were out. here are some tank shots and pics of my fish.only got three tropical.2 med plecos and 2 cylcing gold fish.one last one a cycling glass catfish.this is my new 125 gallon.also i mad 2 home made power head filters.they work so good with the penguin 1140 if any1 want details on how to make em ask me.